<template>
  <div class="add-role">
    <header class="add-header">
      <div class="left">
        <span class="arrow" @click="$router.back()"><i class="el-icon-arrow-left" />返回</span>
        <span>|</span>
        <span>添加角色</span>
      </div>
      <div class="right">
        黑马程序员
      </div>
    </header>
    <main class="add-main">
      <div class="step-container">
        <el-steps direction="vertical" :active="activeStep">
          <el-step title="角色信息" />
          <el-step title="权限信息" />
          <el-step title="检查并完成" />
        </el-steps>
      </div>
      <div class="form-container" v-show="activeStep === 1">
        <div class="title">角色信息</div>
        <div class="form">
          <div class="form">
            <el-form class="form-box" :model="roleForm" :rules="roleRules" ref="roleForm">
              <el-form-item label="角色名称" prop="roleName">
                <el-input v-model="roleForm.roleName" />
              </el-form-item>
              <el-form-item label="角色描述" prop="remark">
                <el-input v-model="roleForm.remark" />
              </el-form-item>
            </el-form>
          </div>
        </div>
      </div>
      <div class="form-container" v-show="activeStep === 2">
        <div class="title">权限配置</div>
        <div class="tree-wrapper">
          <template v-for="item in treeList">
            <div class="tree-item" :key="item.id">
              <div class="tree-title">{{ item.title }}</div>
              <el-tree
                ref="tree"
                show-checkbox
                default-expand-all
                node-key="id"
                :props="{ label: 'title' }"
                :data="item.children"
              />
            </div>
          </template>
        </div>
      </div>
      <div class="form-container" v-show="activeStep === 3">
        <div class="title">检查并完成</div>
        <div class="form">
          <div class="info">
            <div class="form-item">角色名称：{{ roleForm.roleName }}</div>
            <div class="form-item">角色描述：{{ roleForm.remark }}</div>
            <div class="form-item">角色权限：</div>
            <div class="tree-wrapper">
              <div v-for="item in disabledTreeList" :key="item.id" class="tree-item">
                <div class="tree-title">{{ item.title }}</div>
                <el-tree
                  ref="diabledTree"
                  :data="item.children"
                  show-checkbox
                  check-strictly
                  default-expand-all
                  node-key="id"
                  :props="{ label: 'title'}"
                />
              </div>
            </div>
          </div>
        </div>
      </div>
    </main>
    <footer class="add-footer">
      <div class="btn-container">
        <el-button v-if="activeStep > 1" @click="decreaseStep">上一步</el-button>
        <el-button type="primary" v-if="activeStep < 3" @click="increaseStep">下一步</el-button>
        <el-button v-if="activeStep === 3" type="primary" @click="confirmAdd">确认添加</el-button>
      </div>
    </footer>
  </div>
</template>

<script>
import { getTreeListAPI, createRoleUserAPI, getRoleDetailAPI, updateRoleAPI } from '@/api/system'
export default {
  data() {
    return {
      activeStep: 1,
      roleForm: {
        roleName: '',
        remark: '',
        perms: []
      },
      roleRules: {
        roleName: [
          { required: true, message: '请输入角色名称', trigger: 'blur' }
        ],
        remark: [
          { required: true, message: '请输入描述名称', trigger: 'blur' }
        ]
      },
      treeList: [],
      disabledTreeList: [],
      roleId: this.$route.query.id
    }
  },
  methods: {
    decreaseStep() {
      this.activeStep--
    },
    increaseStep() {
      if (this.activeStep === 1) {
        this.$refs.roleForm.validate(valid => {
          if (!valid) return
          this.activeStep++
        })
      } else if (this.activeStep === 2) {
        this.roleForm.perms = []
        this.$refs.tree.forEach(tree => {
          this.roleForm.perms.push(tree.getCheckedKeys())
        })
        // this.roleForm.perms.flat()：将二维数组展开为一维数组
        if (this.roleForm.perms.flat().length === 0) {
          this.$message.error('请至少选择一个权限点')
        } else {
          this.activeStep++
          // 回填已选择数据
          this.$refs.diabledTree.forEach((tree, index) => {
            tree.setCheckedKeys(this.roleForm.perms[index])
          })
        }
      }
    },
    async getTreeList() {
      const { data } = await getTreeListAPI()
      this.treeList = data
      this.disabledTreeList = JSON.parse(JSON.stringify(data))
      this.allDisabled(this.disabledTreeList)
    },
    allDisabled(treeList) {
      _rescueList(treeList)
      function _rescueList(list) {
        for (const item of list) {
          item.disabled = true
          if (item.children) {
            _rescueList(item.children)
          }
        }
      }
    },
    async confirmAdd() {
      const fn = this.roleId ? updateRoleAPI : createRoleUserAPI
      const tip = this.roleId ? '编辑' : '新增'
      await fn(this.roleForm)
      this.$message.success(`${tip}角色成功`)
      this.$router.back()
    },
    async getRoleDetail() {
      const { data } = await getRoleDetailAPI(this.roleId)
      // 回填基础表单
      for (const key in this.roleForm) {
        this.roleForm[key] = data[key]
      }
      this.roleForm.roleId = data.roleId
      // 回填Tree
      this.$nextTick(() => {
        this.$refs.tree.forEach((tree, index) => {
          tree.setCheckedKeys(this.roleForm.perms[index])
        })
      })
    }
  },
  async mounted() {
    await this.getTreeList()
    if (this.roleId) {
      this.getRoleDetail()
    }
  }
}
</script>
<style scoped lang="scss">
.add-role {
  background-color: #f4f6f8;
  height: 100vh;

  .add-header {
    display: flex;
    justify-content: space-between;
    padding: 0 20px;
    height: 64px;
    line-height: 64px;
    font-size: 16px;
    font-weight: bold;
    background-color: #fff;

    .left {
      span {
        margin-right: 4px;
      }

      .arrow {
        cursor: pointer;
      }
    }

    .right {
      text-align: right;
    }
  }

  .add-main {
    position: fixed;
    top: 64px;
    bottom: 88px;
    width: 100%;
    overflow-y: auto;
    background: #f4f6f8;
    padding: 20px 230px;
    display: flex;
    .step-container {
      height: 400px;
      width: 200px;
    }
    .form-container {
      flex:1;
      background-color: #fff;
      overflow-y: auto;
      .title {
        height: 60px;
        line-height: 60px;
        padding-left: 20px;
      }
      .form {
        margin-bottom: 20px;
        padding: 20px 65px 24px;
        .el-form {
          display: flex;
          flex-wrap: wrap;
        }
        .info{
          font-size:14px;
          color:#666;
          .form-item{
            margin-bottom:20px;
          }
        }
      }
      .form-box{
        width: 600px;
        display: flex;
        flex-direction: column;
      }
    }
  }

  .add-footer {
    position: fixed;
    bottom: 0;
    width: 100%;
    padding: 24px 50px;
    color: #000000d9;
    font-size: 14px;
    background: #fff;
    text-align: center;
    z-index: 10001;
  }
  .tree-wrapper {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    .tree-item {
      flex: 1;
      padding: 0px 4px;
      text-align: center;
      .tree-title {
        background: #f5f7fa;
        text-align: center;
        padding: 10px 0;
        margin-bottom: 12px;
      }
    }
  }
}
</style>
